stoneyridge: Rename hudson to southbridge

Simplify funciton names and remove reference to hudson in stoneyridge.
The southbridge in Stoney Ridge is Kern and hudson naming is
no longer accurate.

BUG=b:62200157
BRANCH=none
TEST=Build and booted on Kahlee.

Change-Id: Ide7a72dae69b881997101f1e37a1ac739901744d
Signed-off-by: Marc Jones <marcj303@gmail.com>
Reviewed-on: https://review.coreboot.org/20912
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/soc/amd/stoneyridge/hda.c

@@ -20,7 +20,7 @@
 #include <device/pci_ops.h>
 #include <arch/io.h>
 #include <delay.h>
-#include <soc/hudson.h>
+#include <soc/southbridge.h>
 
 static const unsigned short pci_device_ids[] = {
 	PCI_DEVICE_ID_AMD_SB900_HDA,